to the market site today. >> reporter: but back in china, investors say china integrated energy was pulling a fast one. watch what the photos say on the one day the american investors were invited to the factory for a tour. >> the first time in four months, it's 7:00 in the morning, we see tanker trucks show up, and then at precisely 9:45, a big red bus shows up and it's full of investors. >> reporter: they're given a tour and put back on the bus and driven away. >> and the place shuts back down again just like it had been for the four months prior. >> reporter: and in the weeks following the investor tour, anything going on? >> nothing. just as dead as before. >> reporter: so this was a complete con job. >> exactly. >> reporter: china integrated energy, which owns two other fuel plants, acknowledges there were problems at this factory but denied there was any fraud. even so, it was one of some 70 chinese companies that an abc news investigation found have been delisted or left nasdaq and the new york stock exchange because of suspected fraud. >> the common theme among the many case